From Zentalk Taiwan Beta Tester Section, Android 5.0 (Lollipop) For Zenfone 4 is Ready for the Next Beta Firmware.
Zenfone 5/6 v3.xx.xxx will be the version of Android 5.0 Lollipop
Zenfone 4 v7.x.x will be the version of Android 5.0 Lollipop
Zenfone 4 v7.x.x will be the version of Android 5.0 Lollipop
Note: Beta Firmware only restricted to several person (beta tester), after the evaluation complete ASUS will roll out Android 5.0 (lollipop) for Zenfone 4/5/6.